Question

If A=2i-3j-k B=i+4j-2k find A+B multiply A-B

Answer 1

Answer:

Explanation:

A=2i-3j-k

B=i+4j-2k

A+B = 3i + j -3k

A-B = i -7j +k

If we want scalar product then

(A+B).(A-B) = 3 - 7 - 3 = -7

If we vant Vector product then

(A+B) X (A-B) = -20i -6j -22k [By determinants method]